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EPISODE

7. War at the Roses

Blair is caught off-guard - and not in a good way - by a surprise guest at her birthday party. Having had enough of Chuck and Blair's games, Serena and Nate decide to plan an intervention.

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Complete story — includes the ending

Fearing that their vindictive games will get worst, Nate and Serena try to get a peace treaty between the warring exes for Blair's 20th birthday. Dan comes up with a scheme that will allow Jenny to return to the Upper East Side to celebrate Rufus and Lily's anniversary celebration, but his plan ultimately backfires. Serena and Colin try to resist their desires for each other. Swedish singer Robyn makes a cameo performing an acoustic version of " Hang with Me " at Blair's birthday party celebration. Title reference: The 1989 film The War of the Roses.

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